CN210524096U - Arc stabilizer of alternating current argon arc welding machine - Google Patents
Arc stabilizer of alternating current argon arc welding machine Download PDFInfo
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- CN210524096U CN210524096U CN201921601668.6U CN201921601668U CN210524096U CN 210524096 U CN210524096 U CN 210524096U CN 201921601668 U CN201921601668 U CN 201921601668U CN 210524096 U CN210524096 U CN 210524096U
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Abstract
The utility model discloses an exchange arc device of argon arc welding machine, its technical scheme main points are: the voltage detection device outputs a voltage detection signal, the voltage control device is coupled to the voltage detection device to receive the voltage detection signal and output a corresponding voltage control signal, the zero-crossing detection device outputs a zero-crossing detection signal, the zero-crossing control device is coupled to the zero-crossing detection device to receive the zero-crossing detection signal and output a zero-crossing control signal, and the execution device synchronously receives the zero-crossing control signal and the voltage control signal and responds to the zero-crossing control signal and the voltage control signal to realize arc stabilization. The executing device provides extra voltage for the high-frequency arc striking device in a welding state in the short zero-crossing period of the alternating current so as to make up the situation that the voltage of the high-frequency arc striking device is insufficient in the alternating current commutation process, improve the success rate of arc striking and maintain the stability of electric arcs.
Description
Technical Field
The utility model relates to the field of welding technology, in particular to arc stabilizing device of alternating current argon arc welding machine.
Background
The argon arc welding technology is a welding technology which utilizes the protection of argon gas on a metal welding material on the basis of the principle of common electric arc welding, melts the welding material into liquid on a welded base material through zero crossing of high alternating current to form a molten pool, and enables the welded metal and the welding material to be metallurgically combined. Because the surfaces of the aluminum, the magnesium and the alloy materials thereof are easy to oxidize, a compact oxide film is formed, the melting point of the oxide film is higher than that of the aluminum and is not easy to break, and the welding of the aluminum, the magnesium and the alloy materials thereof mainly adopts alternating current argon arc welding.
Referring to fig. 1, the ac argon arc welding machine includes a power supply circuit 6 and a high-frequency arc striking circuit 7, wherein ac power input into the power supply circuit 6 from a power grid needs to be rectified once to be converted into dc power, and then converted into high-frequency ac power through inversion once, and then the ac power is converted into ac power with zero-crossing of low-voltage large ac power through a main transformer, and then converted into dc power through rectification for the second time, and finally converted into ac power through inversion for the second time, and the ac power at this time can be used as a power supply in the high-frequency arc striking circuit 7.
Because the alternating current used by the alternating current argon arc welding is constantly changing, the energy of the electric arc is also constantly changing. When the alternating current passes through zero, the arc is extinguished and must be reignited. The voltage required for re-striking the arc is high and the voltage supplied by the power supply circuit 6 is insufficient to maintain continuous burning of the arc, causing the arc to be unstable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an exchange arc welding machine's steady arc device to prior art exists, it has good steady arc effect.
The above technical purpose of the present invention can be achieved by the following technical solutions: an arc stabilizer of an alternating current argon arc welding machine comprises a power circuit, a high-frequency arc striking circuit, a voltage detection device, a zero-crossing detection device, a voltage control device, a zero-crossing control device and an execution device, the voltage detection device is used for detecting the direct current voltage generated after primary rectification in the power circuit and outputting a corresponding voltage detection signal, the voltage control device is coupled to the voltage detection device to receive the voltage detection signal and output a corresponding voltage control signal, the zero-crossing detection device is used for detecting the voltage of alternating current on the primary side of a main transformer in the power supply circuit and outputting a zero-crossing detection signal, the zero-crossing control device is coupled with the zero-crossing detection device to receive the zero-crossing detection signal and output a corresponding zero-crossing control signal, the executing device synchronously receives the zero-crossing control signal and the voltage control signal and responds to the zero-crossing control signal and the voltage control signal to realize arc stabilization;
when the argon arc welding machine is in a welding state and alternating current passes through zero, the voltage detection device outputs a high-level voltage detection signal, the zero-crossing detection device outputs a high-level zero-crossing detection signal, and the voltage control device and the zero-crossing control device jointly control the execution circuit to apply extra arc stabilizing voltage on a primary side of secondary inversion in the power circuit.
According to the technical scheme, the voltage detection device judges whether the argon arc welding machine is in a welding state or not by detecting the voltage of the direct current in the power circuit, and meanwhile, according to the time of the zero-crossing detection device for detecting the reverse zero-crossing of the alternating current in the power circuit, the execution device provides extra voltage for the high-frequency arc ignition device during welding in the short zero-crossing period of the alternating current, so that the condition that the voltage of the high-frequency arc ignition device is insufficient in the alternating current reversing process is made up, the arc ignition success rate is improved, and the stability of the electric arc is maintained.
Preferably, the voltage control device comprises a voltage reference circuit, a voltage comparison circuit and a switch circuit, the voltage reference circuit provides a voltage reference signal when the argon arc welding machine is in an idle state to the voltage comparison circuit, the voltage comparison circuit receives the voltage detection signal and the voltage reference signal and outputs the voltage comparison signal by comparing the voltage detection signal and the voltage reference signal, and the switch circuit is coupled to the voltage comparison circuit to receive the voltage comparison signal and output a corresponding voltage control signal.
Through the technical scheme, the direct-current voltage in the power circuit of the argon arc welding machine in the no-load state is higher than the direct-current voltage in the argon arc welding machine in the load state, the voltage comparison circuit outputs the difference value between the voltage detection signal and the voltage reference signal, and when the state of the argon arc welding machine is changed, the difference value is correspondingly changed, so that the on-off state of the switch circuit can be changed, and the working state of the argon arc welding machine can be more directly embodied.
Preferably, the zero-crossing detecting apparatus includes a receiving circuit, a current limiting circuit, and an output circuit, wherein the receiving circuit is configured to detect a voltage of an ac power at a primary side of a main transformer in the power circuit and output an ac power detection signal, the current limiting circuit is coupled to the receiving circuit to receive the ac power detection signal and output a corresponding current limiting signal, and the output circuit is coupled to the current limiting circuit to receive the current limiting signal and output a corresponding zero-crossing detection signal.
According to the technical scheme, the current limiting circuit is used for shunting the alternating current zero-crossing signal received from the power circuit, the output circuit is prevented from being damaged by the current limiting signal of the overhigh current, and the output circuit is more easily detected by the output circuit and reacts to the zero-crossing detection signal once the current limiting signal changes after the value of the current limiting signal is reduced.
Preferably, the switching circuit comprises a transistor Q2 and a relay KM2, a base of a transistor Q2 is coupled to the voltage comparison circuit, a collector of the transistor Q2 is coupled to a power source VCC, an emitter of the transistor Q2 is coupled to one end of the relay KM2, one end of the relay KM2 is grounded, and a normally open contact KM2-1 of the relay KM2 is connected in series in the actuator.
Through the technical scheme, the voltage comparison signal is selected by the triode Q2 in a brushing mode, when the voltage comparison signal enables the triode Q2 to be conducted, the relay KM2 works, and when the voltage comparison signal cannot enable the triode Q1 to be conducted, the relay KM2 does not work.
Preferably, the current limiting circuit includes a resistor R1, a resistor R2, and a resistor R3, the resistor R1 is connected in series with the resistor R3, the other end of the resistor R1 is coupled to the receiving circuit, the other end of the resistor R3 is coupled to the output circuit, one end of the resistor R2 is coupled to a connection point between the resistor R1 and the resistor 2, and the other end of the resistor R2 is grounded.
Through the technical scheme, the resistor R1 and the resistor R3 are connected in series, so that the current in the circuit is reduced, the situation that the triode Q1 is always in a conducting state when the current is too large is avoided, the electric charge in the triode Q1 can be grounded through the resistor R2, and the consumption of the electric charge in the triode Q1 is accelerated.
Preferably, the output circuit includes a transistor Q1, a resistor R4, and a capacitor C1, a base of the transistor Q1 is coupled to the current limiting circuit, a collector of the transistor Q1 is coupled to one end of the resistor R4, the other end of the resistor R4 is coupled to the power VCC, an emitter of the transistor Q1 is grounded, one end of the capacitor C1 is coupled to a connection point between the resistor R4 and the collector of the transistor Q1, the other end of the capacitor C1 is grounded, and a connection point between the resistor R4 and the collector of the transistor Q1 outputs the zero-crossing detection signal.
Through the technical scheme, when the current limiting signal output by the current limiting circuit is a low level signal, the triode Q1 is turned off, the connection point between the resistor R4 and the collector of the triode Q1 is connected with the power supply VCC through the resistor R4, and the zero-crossing detection signal outputs a high level signal, which indicates that the power supply circuit is in the period of alternating current reverse zero-crossing.
Preferably, the execution device is a direct current high voltage circuit.
Through the technical scheme, the execution device applies the direct-current high-voltage power to the primary side of the secondary inversion, and the superposed direct current is converted into alternating current through the secondary inversion, so that the alternating current is conveniently supplied to the high-voltage arc striking device for use.
Preferably, the voltage comparison circuit is a comparator N1.
Through the technical scheme, the comparator is simple in structure and high in sensitivity, and can quickly respond to the change of the direct-current voltage in the power circuit.
To sum up, the utility model discloses the beneficial effect who contrasts in prior art does: the voltage detection device and the zero-crossing detection device are arranged to test the period of the power circuit in which alternating current reversely crosses zero in a load state, and high-voltage direct current is added to the direct current of the power circuit through the execution circuit in the period, so that the alternating current provided to the high-frequency arc striking circuit by the power circuit after secondary inversion is increased, and the arc striking success rate of the high-frequency arc striking circuit and the stability of an electric arc after arc striking are improved.
Drawings
FIG. 1 is a schematic diagram of a prior art structure between a power circuit and a high frequency arc striking circuit;
FIG. 2 is a schematic structural diagram of an embodiment;
fig. 3 is a schematic circuit diagram of the embodiment.
Reference numerals: 1. a voltage detection device; 2. a zero-crossing detection device; 21. a receiving circuit; 22. a current limiting circuit; 23. an output circuit; 3. a voltage control device; 31. a voltage reference circuit; 32. a voltage comparison circuit; 33. a switching circuit; 4. a zero-crossing control device; 5. an execution device; 6. a power supply circuit; 7. high-frequency arc striking circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
An arc stabilizer of an alternating current argon arc welding machine is shown in figure 2 and comprises a power supply circuit 6, a high-frequency arc striking circuit 7, a voltage detection device 1 and a zero-crossing detection device 2, the voltage control device 3, the zero-crossing control device 4 and the execution device 5, wherein the voltage detection device 1 is used for detecting a direct-current voltage V1 generated during primary rectification in the power circuit 6 and outputting a voltage detection signal, the voltage control device 3 is coupled to the voltage detection device 1 to receive the voltage detection signal and output a corresponding voltage control signal, the zero-crossing detection device 2 is used for detecting the zero crossing of an alternating current V2 on the primary side of a main transformer in the power circuit 6 and outputting a zero-crossing detection signal, the zero-crossing control device 4 is coupled to the zero-crossing detection device 2 to receive the zero-crossing detection signal and output a corresponding zero-crossing control signal, and the execution device 5 synchronously receives the zero-crossing control signal and the voltage control signal and responds to the zero-crossing control signal and the voltage control.
Referring to fig. 3, the voltage detection device 1 includes a resistor R6 and a resistor R7.
The resistor R6 and the resistor R7 are connected in series, the other end of the resistor R6 is grounded, the other end of the resistor R7 is coupled to the secondary side of the primary rectification of the power circuit 6, and a voltage detection signal is output from the connection point between the resistor R6 and the resistor R7.
The direct current V1 rectified once in the power circuit 6, the resistor R6 and the resistor R7 form a complete circuit, and the voltage of the direct current V1 is divided by the resistor R6 and the resistor R7 and then input to the voltage comparison circuit as a voltage detection signal. When the argon arc welding machine is in a welding state, the voltage of the direct current V1 is reduced, so that the output voltage detection signal is also reduced.
The voltage control device 3 includes a voltage reference circuit 31, a voltage comparison circuit 32, and a switch circuit 33. The voltage reference circuit 31 includes a sliding rheostat RP1 and a resistor R8. The voltage comparison circuit 32 is a comparator N1. The switching circuit 33 includes a transistor Q2 and a relay KM 2. The transistor Q2 is an NPN type transistor and is model 2SC 4019.
A sliding resistor RP1 and a resistor R8 are connected in series, the other end of the sliding resistor RP1 is coupled to a power source VCC, the sliding end of the sliding resistor RP1 is coupled to a connection point between the sliding resistor RP1 and the resistor R8, the inverting input terminal of a comparator N1 is coupled to a connection point between the resistor R6 and the resistor R7, the inverting input terminal of the comparator N1 is coupled to a connection point between the sliding resistor RP1 and the resistor R8, the base of a transistor Q2 is coupled to the output terminal of a comparator N1, the collector of a transistor Q2 is coupled to the power source VCC, the emitter of the transistor Q2 is coupled to one end of a relay KM2, the other end of the relay KM2 is grounded, and a normally open contact KM2-1 of the relay KM2 is connected in series in the.
The voltage reference signal and the voltage detection signal are both direct-current voltages, and the voltage value of the voltage reference signal is the same as the voltage detection signal provided by the voltage detection device 1 when the argon arc welding machine is in the no-load state. When the voltage detection signal is not less than the voltage reference signal, the comparator N1 outputs a low voltage signal, the diode Q2 is not conducted, the relay KM2 does not work, and the normally open contact KM2-1 of the relay KM2 is disconnected; when the voltage detection signal is smaller than the voltage reference signal, the comparator N1 outputs a high-voltage signal, the diode Q2 is conducted, the relay KM2 works, and the normally open contact KM2-1 of the relay KM2 is closed.
The zero-cross detection device 2 includes a receiving circuit 21, a current limiting circuit 22, and an output circuit 23. The receiving circuit 21 includes a diode D1 and a diode D2. The current limiting circuit 22 includes a resistor R1, a resistor R2, and a resistor R3. The output circuit 23 includes a transistor Q1, a resistor R4, and a capacitor C1. The transistor Q1 is an NPN type transistor and is model 2SC 4019.
The anode of the diode D1 is coupled to one end of the primary side of the main transformer of the power circuit 6, the cathode of the diode D1 is coupled to one end of the resistor R1, the anode of the diode D2 is coupled to the other end of the primary side of the main transformer of the power circuit 6, the cathode of the diode D2 is coupled to the connection point between the resistor R1 and the diode D1, the other end of the resistor R1 is coupled to one end of the resistor R3, the other end of the resistor R3 is coupled to the base of the transistor Q1, one end of the resistor R2 is coupled to the connection point between the resistor R1 and the resistor Q1, and the other end of the resistor R2 is grounded. The collector of the transistor Q1 is coupled to one end of the resistor R4, the other end of the resistor R4 is coupled to the power VCC, the emitter of the transistor Q1 is grounded, one end of the capacitor C1 is coupled to a connection point between the resistor R4 and the collector of the transistor Q1, the other end of the capacitor C1 is grounded, and a zero-crossing detection signal is output from a connection point between the resistor R4 and the collector of the transistor Q1.
When the voltage of the alternating current V2 on the primary side of the main transformer of the power circuit 6 is not 0, the alternating current V2 can provide an electric signal for the base electrode of the triode Q1 through the diode D1 or the diode D2, the triode Q1 is turned on, and the zero-cross detection signal is a low-level signal; when the voltage of the alternating current V2 on the primary side of the main transformer of the power circuit 6 is 0, the triode Q1 is turned off, and the zero-crossing detection signal is a high-level signal.
The zero-crossing control device 4 comprises a resistor R5, a triode Q3 and a relay KM 1. The transistor Q3 is an NPN type transistor and is model 2SC 4019.
The base of the transistor Q3 is coupled to a connection point between the collector of the resistor R4 and the collector of the transistor Q1, the collector of the transistor Q3 is coupled to one end of the resistor R5, the other end of the resistor R5 is coupled to the VCC, the emitter of the transistor Q3 is coupled to one end of the relay KM1, the other end of the relay KM1 is grounded, and the normally open contact KM1-1 of the relay KM1 is connected in series in the execution device 5.
When the zero-crossing detection signal is a high-level signal, the triode Q3 is conducted, the relay KM1 works, and the normally open contact KM1-1 of the relay KM1 is closed; when the zero-crossing detection signal is a low-level signal, the triode Q3 is turned off, the relay KM1 does not work, and the normally open contact KM1-1 of the relay KM1 is disconnected.
The actuator 5 comprises a high-voltage power supply and a resistor R9, wherein the high-voltage power supply is a direct-current power supply with the rated voltage of 350 v.
One end of a resistor R9 is coupled with one end of a normally open contact KM1-1 of a relay KM1, the other end of the resistor R9 is coupled with one end of a normally open contact KM2-1 of a relay KM2, the other end of a normally open contact KM1-1 of a relay KM1 is coupled with a high-voltage power supply, and the other end of a normally open contact KM2-1 of the relay KM2 is coupled with the primary side of the secondary power frequency inversion of the power supply circuit 6.
When the normally open contact KM1-1 of the relay KM1 is closed and the normally open contact KM2-1 of the relay KM2 is closed, the high-voltage power supply is connected to the primary side of the secondary power frequency inversion of the power circuit 6; otherwise, the high-voltage power supply is not connected.
The working principle is as follows:
state 1: when the argon arc welding machine is in a load state, the voltage of the direct current V1 received by the voltage detection device 1 is lower than the reference voltage provided by the voltage reference circuit 31, so that the comparator N1 outputs a high-level signal, the triode Q2 is conducted, the relay KM2 works, and the normally open contact KM2-1 of the relay KM2 is closed. If the alternating current V2 in the power circuit 6 has zero crossing in the working process of the relay KM2, the triode Q1 is turned off, the triode Q3 is turned on, the relay KM1 works, the normally open contact KM1-1 of the relay KM1 works, and a high-voltage power supply is applied to the primary side of the secondary inversion of the power circuit 6 through the resistor R9. If the alternating current V2 is not in the zero-crossing stage in the working process of the relay KM2, the triode Q1 is in a conducting state, the triode Q3 is closed, the relay KM1 does not work, and the execution circuit is in a broken state.
State 2: when the argon arc welding machine is in a no-load state, the comparator N1 outputs a low level signal, the triode Q2 is turned off, the relay KM2 does not work, the normally open contact KM2-1 of the relay KM2 keeps a disconnected state, and no matter whether the alternating current V2 crosses zero or not, the high-voltage power supply cannot be applied to the primary side of the secondary inversion of the power circuit 6.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (8)
1. The utility model provides an exchange arc device of argon arc welding machine, includes power supply circuit (6), high frequency arc circuit (7), characterized by: also comprises a voltage detection device (1), a zero-crossing detection device (2), a voltage control device (3), a zero-crossing control device (4) and an execution device (5), the voltage detection device (1) is used for detecting the direct current voltage generated after primary rectification in the power circuit (6) and converting the direct current voltage into a voltage detection signal, the voltage control device (3) is coupled to the voltage detection device (1) to receive the voltage detection signal and output a corresponding voltage control signal, the zero-crossing detection device (2) is used for detecting the voltage of alternating current on the primary side of a main transformer in a power circuit (6) and converting the voltage into a zero-crossing detection signal, the zero-crossing control device (4) is coupled with the zero-crossing detection device (2) to receive the zero-crossing detection signal and output a corresponding zero-crossing control signal, the executing device (5) synchronously receives the zero-crossing control signal and the voltage control signal and responds to the zero-crossing control signal and the voltage control signal to realize arc stabilization;
when the argon arc welding machine is in a welding state and alternating current passes through zero, the voltage detection device (1) outputs a high-level voltage detection signal, the zero-crossing detection device (2) outputs a high-level zero-crossing detection signal, and the voltage control device (3) and the zero-crossing control device (4) jointly control the execution circuit to apply arc stabilizing voltage on a primary side of secondary inversion in the power circuit (6).
2. The arc stabilizer of the alternating current argon arc welding machine according to claim 1, which is characterized in that: the voltage control device (3) comprises a voltage reference circuit (31), a voltage comparison circuit (32) and a switch circuit (33), wherein the voltage reference circuit (31) provides a voltage reference signal when the argon arc welding machine is in an idle state for the voltage comparison circuit (32), the voltage comparison circuit (32) receives the voltage detection signal and the voltage reference signal and outputs the voltage comparison signal by comparing the voltage detection signal and the voltage reference signal, and the switch circuit (33) is coupled to the voltage comparison circuit (32) to receive the voltage comparison signal and output a corresponding voltage control signal.
3. The arc stabilizer of the alternating current argon arc welding machine according to claim 1, which is characterized in that: the zero-crossing detection device (2) comprises a receiving circuit (21), a current limiting circuit (22) and an output circuit (23), wherein the receiving circuit (21) is used for detecting the voltage of alternating current on the primary side of a main transformer in the power supply circuit (6) and outputting an alternating current detection signal, the current limiting circuit (22) is coupled to the receiving circuit (21) to receive the alternating current detection signal and output a corresponding current limiting signal, and the output circuit (23) is coupled to the current limiting circuit (22) to receive the current limiting signal and output a corresponding zero-crossing detection signal.
4. The arc stabilizer of the alternating current argon arc welding machine according to claim 2, which is characterized in that: the switch circuit (33) comprises a triode Q2 and a relay KM2, wherein the base electrode of the triode Q2 is coupled to the voltage comparison circuit (32), the collector electrode of the triode Q2 is coupled to a power supply VCC, the emitter electrode of the triode Q2 is coupled to one end of the relay KM2, one end of the relay KM2 is grounded, and a normally-open contact KM2-1 of the relay KM2 is connected in series in the execution device (5).
5. The arc stabilizer of the alternating current argon arc welding machine according to claim 3, which is characterized in that: the current limiting circuit (22) comprises a resistor R1, a resistor R2 and a resistor R3, the resistor R1 and the resistor R3 are connected in series, the other end of the resistor R1 is coupled to the receiving circuit (21), the other end of the resistor R3 is coupled to the output circuit (23), one end of the resistor R2 is coupled to a connection point between the resistor R1 and the resistor R2, and the other end of the resistor R2 is grounded.
6. The arc stabilizer of the alternating current argon arc welding machine according to claim 3, which is characterized in that: the output circuit (23) comprises a triode Q1, a resistor R4 and a capacitor C1, wherein the base of the triode Q1 is coupled to the current limiting circuit (22), the collector of the triode Q1 is coupled to one end of the resistor R4, the other end of the resistor R4 is coupled to a power supply VCC, the emitter of the triode Q1 is grounded, one end of the capacitor C1 is coupled to a connection point between the resistor R4 and the collector of the triode Q1, the other end of the capacitor C1 is grounded, and a zero-crossing detection signal is output from the connection point between the collector of the resistor R4 and the collector of the triode Q1.
7. The arc stabilizer of the alternating current argon arc welding machine according to claim 1, which is characterized in that: the execution device (5) is a direct-current high-voltage circuit.
8. The arc stabilizer of the alternating current argon arc welding machine according to claim 2, which is characterized in that: the voltage comparison circuit (32) is a comparator N1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921601668.6U CN210524096U (en) | 2019-09-25 | 2019-09-25 | Arc stabilizer of alternating current argon arc welding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921601668.6U CN210524096U (en) | 2019-09-25 | 2019-09-25 | Arc stabilizer of alternating current argon arc welding machine |
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| CN210524096U true CN210524096U (en) | 2020-05-15 |
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